Double hollow coil gas meter non-magnetic signal obtaining device and signal obtaining method, gas meter

Abstract

The present invention discloses a non-magnetic signal obtaining device for a double hollow coil gas meter and a signal obtaining method and a gas meter. The signal obtaining device at least comprises a disc and a metal rod, a gear is arranged on the circumference of the disc, a round shaft is fixed on the disc, an elliptical slot perpendicular to the length direction of the metal rod is arranged in the middle of the metal rod, the disc is arranged on the base meter of the gas meter and meshes with the output gear of the base meter, the two ends of the metal rod are respectively arranged on the base meter through fixings, the fixings at both ends are wound with coils and the lead wires of the coils are connected to the circuit board of the gas meter, and the round shaft is passed through the elliptical slot; when the gas flows through the base meter, the output gear of the base meter rotates to drive the disc to rotate, thereby driving the round shaft to reciprocate in the elliptical slot along its length direction and then driving the metal rod to reciprocate alternately in the two fixings. The signal obtaining device effectively avoids the magnetic interference of the traditional double reed switch and double Hall element method, as well as the optical interference problem of photoelectric signal obtaining.

Description

Technical Field

[0001] The invention relates to the technical field of instrument measurement, and in particular to a non-magnetic signal obtaining device and a signal obtaining method for a double hollow coil gas meter, and a gas meter. Background Art

[0002] At present, the commonly used measurement and collection methods for gas meters are mainly double reed switches, double Hall element methods and photoelectric information acquisition, etc. Among them, the double reed switches and double Hall element information acquisition methods are easily disturbed by magnetic fields and produce false counts; similarly, photoelectric information acquisition is also disturbed by light and produces false counts, and has high requirements for the light shielding of the shell.

[0003] The prior art also uses ferrite cores to increase inductance and converge magnetic flux lines to achieve external metal detection. However, the external magnetic field can easily saturate the ferrite core and make it ineffective, that is, the magnetic interference problem cannot be avoided, and it is not as simple as using Hall.

[0004] A Chinese patent with publication number CN111998904A discloses a non-magnetic metering device, which winds the circuit into a round shape on a PCB to use as an inductor to increase the relative area with the metal object. However, due to the low inductance and high oscillation frequency, high requirements are placed on the circuit and software processing algorithm, and a dedicated MCU is required for processing. Generally, whole meter manufacturers cannot implement it themselves and need to purchase modules from outside, and the cost is uncontrollable. Summary of the invention

[0005] In order to overcome the shortcomings of the above technologies, the present invention provides a double hollow coil gas meter non-magnetic signal obtaining device, which has a simple structure, is easy to implement, has high reliability, and effectively avoids the magnetic interference of the traditional double reed switch and double Hall element method, and the optical interference problem of photoelectric signal obtaining. The present invention also provides a signal obtaining method of the double hollow coil gas meter non-magnetic signal obtaining device and a gas meter.

[0006] Terminology explanation:

[0007] 1. Electromechanical signal conversion: convert the mechanical rotation signal of the base meter into an electrical signal that can be collected and processed.

[0008] 2. Overdamped state: When the metal rod moves into the inside of the hollow coil, it is in an overdamped state.

[0009] 3. Underdamped state: When the metal rod moves out of the hollow coil, it is in an underdamped state.

[0010] The technical solution adopted by the present invention to overcome the technical problems is:

[0011] A non-magnetic signal obtaining device for a double hollow coil gas meter comprises at least a disc and a metal rod, wherein a gear is arranged on the circumference of the disc, a circular shaft is fixed on the disc, an elliptical slot perpendicular to the length direction of the metal rod is arranged in the middle of the metal rod, the disc is arranged on the base meter of the gas meter and meshes with the output gear of the base meter, the two ends of the metal rod are respectively arranged on the base meter through fixings, the fixings at both ends are wound with coils and the lead wires of the coils are connected to the circuit board of the gas meter, and the circular shaft is passed through the elliptical slot; when the gas flows through the base meter, the output gear of the base meter rotates to drive the disc to rotate, thereby driving the circular shaft to reciprocate in the elliptical slot along its length direction and then driving the metal rod to reciprocate alternately in the two fixings.

[0012] Furthermore, the fixing member and the disc are both made of non-magnetic material to avoid interference with the signal acquisition process.

[0013] Furthermore, the fixing member and the disc are made of plastic material, which is low in price, light in weight, and easy to process.

[0014] Furthermore, the outer surface of the fixing piece is provided with a groove for winding the coil, and the fixing piece is provided with a through hole matching the shape of the metal rod along the central axis so that the metal rod can reciprocate alternately in the two fixing pieces.

[0015] Furthermore, the metal rod is cylindrical, the cross-section of the through hole is circular, and the diameter of the through hole is slightly larger than the diameter of the metal rod.

[0016] Furthermore, the length of the elliptical slot is greater than or equal to the diameter of the circle where the circular axis is located.

[0017] The present invention also provides a method for obtaining a signal using the non-magnetic signal obtaining device for a double hollow coil gas meter as described above, which at least comprises the following steps:

[0018] S1. When gas flows through the base meter, the output gear of the base meter rotates, driving the disc to do circular motion;

[0019] S2, the disc drives the circular shaft to make circular motion, and at the same time, it makes reciprocating motion in the elliptical slot along the length direction of the elliptical slot;

[0020] S3, the metal rod reciprocates in two fixed parts;

[0021] S4. Assume that the two ends of the metal rod are respectively the first end and the second end. When the first end of the metal rod moves into the fixing part close to the first end of the metal rod, the metal rod is completely inserted into the inside of the coil close to the first end of the metal rod. At this time, the excitation signal received by the first end of the metal rod is in the strongest over-damped state, and there is no pulse output after circuit processing. At the same time, the second end of the metal rod is completely separated from the inside of the coil close to the second end of the metal rod. At this time, the excitation signal received by the second end of the metal rod is in the strongest under-damped state, and there is a pulse output after circuit processing.

[0022] Furthermore, every time the disc rotates one circle, the two coils alternately enter an overdamped state and an underdamped state, thereby realizing the electromechanical signal conversion of the gas meter.

[0023] The present invention also provides a gas meter, which at least includes a base meter and also includes the double hollow coil gas meter non-magnetic signal obtaining device as described above, or uses the signal obtaining method as described above to measure gas flow.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention converts the circular motion of the base meter output gear into the reciprocating motion of the metal rod through a mechanical structure, so that the two hollow coils alternately enter the over-damped and under-damped states, and realizes electromechanical conversion through circuit post-processing, which greatly increases the contrast of the under-damped and over-damped oscillation intensity.

[0026] 2. The present invention has a simple structure, is easy to implement, and has high reliability. It effectively avoids the magnetic interference of the traditional double reed switch and double Hall element method, as well as the optical interference problem of photoelectric signal acquisition.

[0027] 3. The structure of the present invention makes circuit processing simple, and no special MCU is needed for processing. The main control MCU of the gas meter can be directly used, which is lower in cost.

[0028] 4. The present invention still adopts the method of alternating two signals, and the main logic of the existing Hall signal acquisition software algorithm remains unchanged, which is convenient for software transplantation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic structural diagram of a non-magnetic signal obtaining device for a double hollow coil gas meter according to an embodiment of the present invention.

[0030] In the figure, 1, fixing part, 11, groove, 12, through hole, 2, coil, 3, disk, 31, round shaft, 4, metal rod, 41, elliptical slot. DETAILED DESCRIPTION

[0031] In order to facilitate those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The following is only exemplary and does not limit the protection scope of the present invention.

[0032] Embodiment 1,

[0033] like Figure 1 As shown, a non-magnetic signal obtaining device for a double hollow coil gas meter described in this embodiment at least includes a fixing part 1, a coil 2, a disc 3 and a metal rod 4.

[0034] The outer surface of the fixing part 1 is provided with a groove 11, which is convenient for winding the coil 2. The coil is not easily detached from the fixing part after being wound on the groove 11; the fixing part 1 is hollow, and a through hole 12 matching the shape of the metal rod 4 is provided along the central axis, which can carry the metal rod 4 to make reciprocating motion.

[0035] The lead wires of the two coils 2 are connected to the circuit board of the gas meter, and the circuit board of the gas meter is provided with the main control MCU of the entire gas meter. Specifically, the lead wires of the two coils 2 are connected to the main control MCU of the gas meter after passing through the signal conditioning circuit. The signal conditioning circuit is not the innovation of the present invention, and the existing signal conditioning circuit structure can be adopted, which will not be described in detail here.

[0036] A gear is provided on the circumference of the disc 3 , and the gear of the disc is meshed with the output gear of the base meter of the gas meter. A round shaft 31 is fixed on one side of the disc 3 near the edge.

[0037] Both ends of the metal rod 4 can be inserted into the through hole 12 of the fixing member 1 . An elliptical slot 41 perpendicular to the length direction of the metal rod is provided in the middle of the metal rod 4 . The round shaft 31 can be inserted into the elliptical slot 41 .

[0038] In this embodiment, the fixing member 1 and the disk 3 are both made of non-magnetic material. More preferably, the fixing member 1 and the disk 3 are made of plastic material. Plastic is low in price, light in weight, and easy to process.

[0039] The metal rod 4 is preferably cylindrical, and accordingly, the cross section of the through hole 12 is circular, and the diameter of the through hole 12 is slightly larger than the diameter of the metal rod 4, so that the metal rod 4 can pass through the through hole 12 of the fixing member and reciprocate freely.

[0040] Preferably, the length of the elliptical slot 41 is greater than or equal to the diameter of the circle where the circular axis 31 is located.

[0041] The structure of the non-magnetic signal obtaining device of the double air-core coil gas meter described in this embodiment is as follows: Figure 1As shown, first, the disc 3 is fixed on the base meter of the gas meter, specifically, it is fixed in the outer shell outside the base meter, and the disc 3 is meshed with the output gear of the base meter; then, a fixing piece 1 with a coil 2 wound on it is fixed to the base meter, specifically, it is also fixed in the outer shell outside the base meter; then, one end of the metal rod 4 is inserted into the fixed fixing piece 1, and the round axis 31 on the disc 3 is inserted into the elliptical slot 41, and then another fixing piece 1 is put on the metal rod 4 and fixed to the base meter; finally, the lead wires of the two coils 2 are connected to the circuit board of the gas meter.

[0042] The non-magnetic signal obtaining device for a double hollow coil gas meter of the present invention is not limited to the following Figure 1 The horizontal installation method shown can also be installed vertically according to the base meter structure. At this time, the round shaft 31 reciprocates left and right in the elliptical slot 41, and the metal rod 4 reciprocates up and down. In addition to the horizontal and vertical installation methods, the installation can also be reasonably designed according to the specific structure of the gas meter, as long as the round shaft 31 can reciprocate along its length direction in the elliptical slot 41 and the metal rod 4 can reciprocate alternately in the two fixing parts 1.

[0043] The structure of this embodiment makes the circuit processing simple, and no special MCU is required for processing. The main control MCU of the gas meter can be directly used, which has lower cost, simple structure, and is easy to implement.

[0044] Embodiment 2,

[0045] This embodiment provides a method for obtaining a signal by the non-magnetic signal obtaining device of a double air-core coil gas meter as described in Embodiment 1, such as Figure 1 As shown, at least the following steps are included:

[0046] S1. When gas flows through the base meter, the output gear of the base meter rotates, driving the disc 3 to make circular motion;

[0047] S2, the disc drives the circular shaft 31 to also make circular motion, and at the same time make reciprocating motion in the elliptical slot 41 along the length direction of the elliptical slot;

[0048] S3, the circular shaft 31 drives the metal rod 4 to reciprocate in the two fixing parts 1;

[0049] S4. When the left end of the metal rod 4 moves into the fixing part 1 close to the left end, the metal rod 4 is completely inserted into the interior of the coil 2 at the left end, that is, the interior of the coil 2 at the left end is filled with the metal rod 4. At this time, the excitation signal received by the left end of the metal rod 4 is in the strongest over-damped state, and there is no pulse output after circuit processing; at the same time, the right end of the metal rod 4 is completely separated from the interior of the coil 2 at the right end, that is, there is no metal rod 4 inside the coil 2 at the right end. At this time, the excitation signal received by the right end of the metal rod 4 is in the strongest under-damped state, and there is a pulse output after circuit processing.

[0050] Each time the disk 3 rotates one circle, the two coils 2 alternately enter an overdamping state and an underdamping state, which can avoid overcounting caused by mechanical jitter and reliably realize the electromechanical signal conversion of the gas meter.

[0051] Through the signal obtaining method of the double hollow coil gas meter non-magnetic signal obtaining device described in this embodiment, the two hollow coils are alternately put into the over-damped and under-damped states, and the electromechanical conversion is realized through circuit post-processing, which greatly increases the contrast of the under-damped and over-damped oscillation intensity, and effectively avoids the magnetic interference of the traditional double reed switch and double Hall element method, and the optical interference problem of photoelectric signal obtaining; this method still adopts the method of alternating two signals, and the main logic of the existing Hall signal obtaining software algorithm remains unchanged, which is convenient for software transplantation.

[0052] Embodiment 3,

[0053] This embodiment provides a gas meter, which includes at least a base meter and also includes a double hollow coil gas meter non-magnetic signal obtaining device as described in Example 1, or uses the signal obtaining method described in Example 2 to measure gas flow. The structure of the base meter is an existing structure and will not be repeated here.

[0054] The above only describes the basic principles and preferred embodiments of the present invention. Those skilled in the art may make many changes and improvements based on the above description, and these changes and improvements should fall within the protection scope of the present invention.

Claims

1. A non-magnetic signal obtaining device for a double hollow coil gas meter, characterized in that: The invention comprises at least a disk (3) and a metal rod (4), wherein a gear is provided on the circumference of the disk (3), a round shaft (31) is fixed on the disk (3), an elliptical slot (41) perpendicular to the length direction of the metal rod is provided in the middle of the metal rod (4), the disk (3) is arranged on the base meter of the gas meter and meshes with the output gear of the base meter, the two ends of the metal rod (4) are respectively arranged on the base meter through fixing members (1), the fixing members (1) at both ends are wound with coils (2), and the lead wires of the coils are connected to the circuit board of the gas meter, and the round shaft (31) is passed through the elliptical slot (41); when the gas flows through the base meter, the output gear of the base meter rotates to drive the disk (3) to rotate, thereby driving the round shaft (31) to reciprocate in the elliptical slot (41) along its length direction, thereby driving the metal rod (4) to reciprocate alternately in the two fixing members (1).

2. The non-magnetic signal obtaining device for a double air-core coil gas meter according to claim 1 is characterized in that: The fixing member (1) and the disc (3) are both made of non-magnetic materials.

3. The non-magnetic signal obtaining device for a double air-core coil gas meter according to claim 2 is characterized in that: The fixing member (1) and the disc (3) are made of plastic.

4. The non-magnetic signal obtaining device for a double air-core coil gas meter according to claim 1, characterized in that: The outer surface of the fixing piece (1) is provided with a groove (11) for winding a coil, and the fixing piece is provided with a through hole (12) along the central axis thereof that matches the shape of the metal rod (4) so ​​that the metal rod can alternately reciprocate in the two fixing pieces.

5. The non-magnetic signal obtaining device for a double air-core coil gas meter according to claim 4, characterized in that: The metal rod (4) is cylindrical, the cross section of the through hole (12) is circular, and the diameter of the through hole (12) is slightly larger than the diameter of the metal rod (4).

6. The non-magnetic signal obtaining device for a double air-core coil gas meter according to claim 1, characterized in that: The length of the elliptical slot (41) is greater than or equal to the diameter of the circle where the circular axis (31) is located.

7. A method for obtaining a signal using a non-magnetic signal obtaining device for a double hollow coil gas meter as claimed in any one of claims 1 to 6, characterized in that: At least the following steps are included: S1. When gas flows through the base meter, the output gear of the base meter rotates, driving the disc (3) to make a circular motion; S2, the disc drives the circular shaft (31) to also make circular motion, and at the same time makes reciprocating motion in the elliptical slot (41) along the length direction of the elliptical slot; S3, the metal rod (4) reciprocates in the two fixing members (1); S4. Assume that the two ends of the metal rod (4) are respectively a first end and a second end. When the first end of the metal rod (4) moves into the fixing member (1) near the first end of the metal rod, the metal rod completely penetrates into the coil (2) near the first end of the metal rod. At this time, the excitation signal received by the first end of the metal rod is in the strongest over-damped state, and no pulse is output after being processed by the circuit. At the same time, the second end of the metal rod (4) completely leaves the coil (2) near the second end of the metal rod. At this time, the excitation signal received by the second end of the metal rod is in the strongest under-damped state, and a pulse is output after being processed by the circuit.

8. The method for obtaining trust according to claim 7, characterized in that: Each time the disc (3) rotates one circle, the two coils (2) alternately enter an overdamping state and an underdamping state, thereby realizing electromechanical signal conversion of the gas meter.

9. A gas meter, comprising at least a base meter, characterized in that: It also includes a non-magnetic signal obtaining device for a double hollow coil gas meter as described in any one of claims 1 to 6, or uses the signal obtaining method described in claim 7 or 8 to measure gas flow.

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